Reheating burner for sheet glass



March 10, 1925- 1,529,275

. A. REECE RBHEATING BURNER FOR SHEET GLASS Filed Feb 23 1924 a/aifph A.189906 ATTUP/VE) Patented Mar. 10, 1925.

UNITED STATES PATENT OFFICE.

JOSEPH A R-EIECEv OF TOLEDO, OHIO. ASSIGNOR TO THE LIBBEY-OWENS SHEETGLASS COMPANY, OF TOLEDO, OHIO. A CORPORATION OF OHIO.

REHEATING BURNER FOR SHEET GLASS.

Application filed February 23, 1924. Serial No. 694,663.

To all whom, it may concern:

Be it known that I Josrrn A. Error. 21 citizen of the United States,residing at T- ledO. in thicounty of linens and Sta e of ()hio. haveimenti-il new and useful lin- ])l'()\'t'lllt'lllS in iii-heating Burnerfor Sheet Glass. of which the following is :1 spccificm tion.

This invention relates to impri'ivemcnts in the art of drawing sheetglass. and more particularly to an improved type of gas burner forreheating the sheet at an inter- .mcdiate stage of the sheet-formingoperation.

Tn thi- Colbln'n v.-'te|n of drawing sheet glass. \Vlllltlll the sheetis drawn upwardly from a bath ol' molten glass. and then while stillsomewhat plastic bent into the horizontal plane :ilu-ut a vo ded bendingwhen it reheating" burner is positioned aborithe bendin roller forreheating the glass sheet as it leaves the roller. [his burner is (lis-1l l ((l and ilaimed in the patent to Deulin l.4ll. Ttt. granted .\lnich193;. In the form there dis-closed this roller c mprises LL longitudinalgas pipe, positioned pnrnlli'l lo the slu-et-i'arryiug surfa e of theroller, pi in ided ith a longitudinal series at spared ll lil:- or opnings through which the gas ll( out to form a continuous row of flamesplayin; on the surl'ace of the glass Sheet.

The present invention discloses an imrint-(l typ of thishurner whichwill proln l llll c\e sheet of flame across th i-ntirc \iidth of thQlass sheet. this flame bein; ('le'amr and limiter than the llnnlOSproduced in; thr me hanism heretofore in use.

\i cal-l1 i lc ml the H'I'iOF of holes or opening in the ga pipe ispositioned a plate or deflector. the outer dges of the two plateslu-iny' arranged -'li -i l :Hliucent one another in prmido a hm;smitinniuo sl t therein tn cn Uni ol' live plates liaza si-rios ofpening in ilsulitmidinil air to the miv in}: chamber hel um-u theplaice. .ind llll mixture is form-d out thl ugh the -l l by the force oithe emerging: fuses and (Ollil llSllHll lakes plui'c lvoyond the slot inthe form oi :1 long li! oven sheet of llanw. \li adjustable slide \alwI: positioned ver the ai openings in one of the plates to regulate theproportion ol air in the combustion llliXtlHi'. A linc-mcslual creenpositioned between the two plates will remove dirt OI other foreignsubstances that may find their way into the gas sup ly, and thus preventthe projection of sucli impurities onto the glass sheet.

The invention will be more clearly understood from the followingdetailed d s iption of one approved f rm of the apparatus;

In the accompanying drawings:

Fig. 1 is a persp ctive of the improved burner and the adjacent portionsof the sheet-drawing mechanism. the front portion of this view beingshown in longitudinal vertical section.

Fig. 2 is a plan of the burner looking from above.

Fig. 3 is a transverse section through the burner.

The glass sheet 1 is drawn upwardly from the mass of molten glass 2 inreceptacle 3. and while substantially in final sheet form but stillsomewhat plastic is deflected about the cooled hending roller 4 into thehorizontal plane. By this time the sheet has become so cooled byradiation and contact with tllt cooled Iiilltl' i. that it is necessaryto reheat the some to prevent the formation of corrugations by thecurved surface of the roller. and to allow the sheet to be properlyflattened as it is drawn away in the horizontal plane. For this purposethe burner 5 is provided.

This burner consists of a longitudinal gas pipe positioned parall l withthe sheet-carrying surface of roller 4. and provided with a row or rowsof holes or openings 6 through which the gas is forced from the pipe tosupply the rehea ing flames. At each side of the series of openings 6 aplate or deflector 7 is positioned. these plates being substantially ofthe form host hown in Fig. 9. The plates arifastened at their inneredges to the sides of gas pi e :3 and their outer edges are slightlyspacer. apart to provide a long lldl'l't) slot 3 lhcl'll-cl \l!ll. Theseedges of the members 7 may be aced with porcelain or other heat-resiting material as shown at 9. The llpprr late Tis provided ith a seriesof openings i to admit air to the chamber hetueen the t\\o plates toform the combustion mixture. A \'i1l\P plate ll extending longitudinallyol the plate 7 above the several openings 10. is secured to the plate bya series of Scren'bOlts 12 0 erating throughi slots in the valve plate,so t at this plate may be adjusted to close more or less, the openings10. A screw bolt 13 ateatfller end of the valve plate is provided toregulate this adjustment.

Mounted between the two plates 7 is a w fine-meshed screen 14 throughwhich the air and gas must pass before reaching the exit slot 8. Thisscreen tends to collect and re move from the combustion mixture any fineparticles of dirt or other foreign matter that otherwise might beprojected into the flames.

The mixture of air and gas collected in mixing chamber 1:3 between thetwo plates 7 is projected by the force of the gas streams issuing frompipe 5 through the slot 8 where combustion takes place in the form or along continuous flat sheet of liamo 16 which may be directed against thesurface of the glass sheet 1 just as it leaves the bending Hill 4.

It will be noted that by puESing the gases through this mixing chamber15 and continuous slot the series of individual flames that wouldotherwise be formed beyond the holes 6 are combined into one continuoussheet of flame, and at the same time the proper mixture of air and as isformed within chamber 15 before t e mixture is projected through slot 8.The action of the flame will be much the same as that of the well-knownBunsen burner, producing a rather intense hot flame. The gases arecompletely burnt, leaving little soot, and with the addition of thescreen 14 practical- 1y no dirt or foreign substances are 'projectedonto the glass sheet to mar the tire polished surface thereof.

Claims: 1. In a sheet glass forming apparatus, a

reheating burner comprisin a gas pipe having a longitudinal series oiopenin s in one side, and amixing chamber covering the openings andhaving a narrow slot in its outer portion opposite the series ofopenings.

2. In a sheet glass forming apparatus, a

reheating burner comprising a gas pipe hava longitudinal series ofopenings in one side, and a. mixi chamber covering the openings andhaving a narrow slot in its outer portion opposite the series ofopenings, and

air inlet openings in one side wall of the chamber.

3. In a sheet glass forming apparatus, a reheating burner comprisin agas pipe having a longitudinal series of openings in one side, a mixingchamber'covering the openings and having a narrow slot in its outerportion opposite the series of openings, and air inlet openings in oneside wall of the chamber, and ,an adjustable valve plate over the airinlets.

4. In a sheet glass forming apparatus, a rel. ating burner comprising agas pipe havin I 1 longitudinal series of openings in one si e, a mixingCham er covering the openings and llfl 'llg a ilI' HV slot in its outerportion oppwne the s ries of openings, and a *creen in the chamber.

5. In a sheet glass forming apparatus, a reheating burner comprising agas pipe having a longitudinal series of openings in one side, a mixingchamber covering the openings and having a narrow slot in its outerportion opposite the series of opening and air inlet openings in oneside wall of the chamber. an adjustable valvc plate over the air inlets,and a screen in the chamber.

6. In a sheet glass forming apparatus, a reheating burner comprisin agas pipe having a longitudinal series 0 openings in one side, and a'mixing chamber covering the openings and having a narrow slot in itsouter portion opposite the series of 0 enings, the edges of the slotbeing forme of he-ita'esisting material.

7. In a sheet glass forming apparatus, a reheating burner comprising agas pipe havin; a longitudinal series of openings in one side, and amixing chamber covering the openings and having a narrow slot in itsouter portion opposite the series of openings, the edges of the slotbeing formed of porcelain.

Si ned at Toledo, in the county of Lucas and rtate of Ohio, this 19thday of February, 1924.

JOSEPH A. ll-EECE.

